DOC: Rearrange section levels
DOC: Rearrange section levels

To make the `intelmqctl run` subcommands more clearly subcommands and
make them subsections of the `intelmqct run` section, the sections had
to be raised in the whole document.

Closes #1936

certtools/intelmq,certtools/intelmq,certtools/intelmq,aaronkaplan/intelmq,aaronkaplan/intelmq,aaronkaplan/intelmq